add *.swp pattern to top-level .gitignore

(since i use vi and it throws these babies around)

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..55ddb3e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+# i use vi
+*.swp